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VALVES
Level Controllers & Electrodes
Level Controllers and Level Electrodes
Precision Boiler Control for steam, air and water — direct-acting and pilot-operated designs from low to high pressure. Available from Spirax Sarco, Gestra and Valsteam ADCA for all industrial applications.
GESTRA
NRG Series — Level Electrodes
Conductivity-based level electrodes for boiler water level sensing and control.
Level Electrodes
Engineered for precise monitoring and closed-loop control of boiler water levels, these robust capacitance and conductive probes actively prevent costly low-water damage and dangerous overfilling. Fully compliant with stringent international regulations—including SIL 3 safety standards for critical limiters—GESTRA level controls provide reliable, automated protection that minimizes downtime and ensures your boilerhouse operates safely and efficiently around the clock.
NRG 16-11, 17-11, 19-11
NRG 16-11
GESTRA
Product Type: Level Electrodes (Conductive Measurement) Rating: 32 bar to 100 bar / Up to 311 °C Size / Connection: Screwed ¾” ISO 228-1 Best for: Reliable, conductivity-based water level measurement across standard to very high-pressure steam boilers. Key Features:
Pressure and temperature capabilities spanning 32 bar @ 238°C (16-11), 60 bar @ 275°C (17-11), and 100 bar @ 311°C (19-11)
Standardized ¾” ISO 228-1 threaded connection for straightforward installation
Utilizes the conductive measurement principle for accurate liquid level detection
Fully compatible with GESTRA SPECTORmodul electronic control units
NRG 16-50 / NRG 17-50 / NRG 19-50
NRG 16-50 / NRG 17-50 / NRG 19-50
GESTRA
Product Type: Water Level Limiter Electrode (SIL 3)
Rating: 32 bar @ 238 °C (464 psi @ 460 °F) (FOR 16-50)
Size / Connection: Thread 1″ NPT
Best for: Fail-safe low-water cut-off on standard steam boilers.
Key Features:
- SIL 3 certified
- Self-monitoring principle
- 1″ NPT threaded connection
- 32 bar / 238 °C rating ** SEE DATASHEET FOR. MORE INFO
NRG 111-50
NRG 111-50
GESTRA
Product Type: Water Level Limiter Electrode (SIL 3)
Rating: Ultra-High Pressure
Size / Connection: Thread 1″ NPT
Best for: Fail-safe low-water cut-off on ultra-high-pressure utility boilers.
Key Features:
- SIL 3 certified
- Designed for ultra-HP service
- 1″ NPT threaded
- Self-monitoring
NRGT 26-1 / NRGT 26-1S
NRGT 26-1 / NRGT 26-1S
GESTRA
Product Type: Continuous Level Transmitter
Rating: PN 40
Size / Connection: Flanged / Threaded
Best for: Continuous analogue level transmission for trending and control.
Key Features:
- PN 40 rating
- 4–20 mA output
- Flanged or threaded mounting
- SPECTORmodul / SPECTORconnect compatible
GESTRA
NRS Series — Level Switches & Controllers
Level switches and controllers paired with NRG electrodes for complete level management.
Level Switch
Designed to seamlessly integrate with conductive and capacitance electrodes, these advanced limiters and on-off controllers provide critical MIN/MAX water level alarms, run-dry protection, and accurate pump management. Featuring SIL 3-approved, self-monitoring technology and modern Modbus/CAN bus communication options, the NRS series ensures rapid response to critical level changes, safeguarding your plant against catastrophic failures while streamlining your control cabinet architecture.
NRS 1-50
NRS 1-50
GESTRA
Product Type: Water Level Limiter Switch (SIL 3)
Rating: 24 VDC / 100–240 VAC
Size / Connection: DIN rail mount
Best for: Fail-safe low-water cut-off switching unit.
Key Features:
- SIL 3 certified
- Works with 1 or 2 electrodes
- 3-second delay of response
- 24 VDC or 100–240 VAC
NRS 1-53
NRS 1-53
GESTRA
Product Type: Level Switch / Limit Switch
Rating: 24 VDC
Size / Connection: DIN rail mount
Best for: MIN 1 / MIN 2 alarm detection for level control.
Key Features:
- Detects MIN 1 / MIN 2 alarms
- 24 VDC supply
- Works with NRG 10-52 / 16-52
- Panel / DIN rail mount
NRS 1-54
NRS 1-54
GESTRA
Product Type: On-Off Water Level Controller
Rating: 24 VDC
Size / Connection: DIN rail mount
Best for: MAX water level alarm and on-off control.
Key Features:
- Detects & indicates MAX level
- On-off control output
- 24 VDC supply
- Panel / DIN rail mount
NRS 1-55
NRS 1-55
GESTRA
Product Type: On-Off Water Level Controller
Rating: 24 VDC
Size / Connection: DIN rail mount
Best for: MIN level / run-dry alarm and on-off control.
Key Features:
- Detects & indicates MIN / run-dry
- On-off control output
- 24 VDC supply
- Panel / DIN rail mount
NRS 2-50 / NRS 2-51
NRS 2-50 / NRS 2-51
GESTRA
Product Type: Level Switch & Pump Controller Rating: N/A (Electronic Control Unit) Size / Connection: DIN rail mount Best for: Active feedwater pump control combined with comprehensive level alarming and digital plant integration. Key Features:
Actively switches the boiler feedwater pump on and off to maintain optimal water levels
Handles both MIN and MAX alarm thresholds simultaneously
Equipped with CAN bus or Modbus for direct digital communication with higher-level plant networks
Spirax Sarco
Level & Safety Controls
Level probes, controllers, and safety equipment for steam boilers.
Level Controls
Ensure a safe, compliant, and highly efficient working environment with Spirax Sarco Level Controls. Built to meet stringent industry regulations, including rigorous LP40 validation for low-water safety systems, these high-integrity controllers and probes provide accurate, real-time monitoring of boiler water levels. Whether you require standard on-off modulation or advanced, self-monitoring alarm and shutdown panels (like the LCS series), Spirax Sarco’s level control solutions mitigate the risk of boilerhouse accidents, minimize costly downtime, and deliver absolute confidence in your system's daily reliability.
LCR2250
LCR2250
Spirax Sarco
Product Type: Level Controller (Limit Switch / PI Controller) Rating: N/A (Electronic Control Unit) Size / Connection: DIN Rail (TH 35) Best for: Processing 4-20mA signals from transmitters to provide accurate limit switching and level control. Key Features:
VdTÜV “Water Level 100” approved for safety compliance
Processes standard 4-20mA analog signals
24 Vdc power supply
Compact DIN rail mounting for control cabinet integration
LCR2251
LCR2251
Spirax Sarco
Product Type: Continuous Level Controller (PI / On-Off) Rating: N/A (Electronic Control Unit) Size / Connection: DIN Rail (TH 35) Best for: Continuous modulating control of a feedwater valve or on/off control of a feedwater pump to maintain steady water levels. Key Features:
Provides continuous PI modulating control via 4-20mA output
Fully compatible with Spirax Sarco LP20 probes and PA420 preamplifiers
24 Vdc power supply
Compact DIN rail mounting for control cabinet integration
LCS1350
LCS1350
Spirax Sarco
Product Type: Boiler Water Level Controller / Level Switch Rating: N/A (Electronic Control Unit) Size / Connection: Panel or DIN Rail mount Best for: Standard, reliable monitoring and on/off control of general industrial boiler water levels. Key Features:
Dedicated boiler water level monitoring and alarm handling
Controls feedwater pumps based on discrete level inputs
Integrates directly with standard Spirax Sarco conductivity probes
Ensures safe and accurate boiler house operation
LCS3050
LCS3050 Low Level Switch
Spirax Sarco
Product Type: Validated Low Water Level Safety System Rating: N/A (Electronic Safety System) Size / Connection: System Specific (Panel/Cabinet Mount) Best for: Providing validated, high-integrity safety shutdowns to drastically reduce the risk of boiler house accidents. Key Features:
Compliant with rigorous LP40 testing and validation standards
Provides failsafe low-water level alarming and immediate boiler shutdown
Designed to meet stringent European boiler safety regulations
Enhances the safe working environment for plant personnel
Spirax Sarco
Level & Safety Controls-Others
Level probes, controllers, and safety equipment for steam boilers.
Level Controls
For items not in the above list:
Others
- APS1 Probe Simulator
- C2 Probe Chamber
- DCV3/B Boiler Feed Check Valve
- LCR2652 BHD50 Level Controller, Operating and Display Unit
- LCS3051 High Water Level Switch
- LCSR1100 Level Control Systems
- LCSR3000 Level Control Systems
- LP11-4 Level Probe
- LP21 Capacitance Level Probe
- LP40 High Integrity, Self-monitoring Low Level Alarm Probe
- LP41 High Integrity, Self-monitoring High Water Level Alarm Probe
